A Strategy to Revise the Constraints of the Mediated Schema

Authors:
Marco A. Casanova;Tanara Lauschner;Luiz André Leme;Karin K. Breitman;Antonio L. Furtado;Vânia M. Vidal
Affiliations:
Department of Informatics, PUC-Rio, Rio de Janeiro, Brazil;Department of Informatics, PUC-Rio, Rio de Janeiro, Brazil;Department of Informatics, PUC-Rio, Rio de Janeiro, Brazil;Department of Informatics, PUC-Rio, Rio de Janeiro, Brazil;Department of Informatics, PUC-Rio, Rio de Janeiro, Brazil;Department of Computing, Federal University of Ceará, Fortaleza, Brazil
Venue:
ER '09 Proceedings of the 28th International Conference on Conceptual Modeling
Year:
2009

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Abstract

In this paper, we address the problem of changing the constraints of a mediated schema M to accommodate the constraints of a new export schema E 0 . We first show how to translate the constraints of E 0 to the vocabulary of M , creating a set of constraints C 0 in such a way that the schema mapping for E 0 is correct. Then, we show how to compute the new version of the constraints of M to accommodate C 0 so that all schema mappings, including that for E 0 , are correct. We solve both problems for subset and cardinality constraints and specific families of schema mappings.